51493717 has 16 divisors (see below), whose sum is σ = 57987072. Its totient is φ = 45324720.

The previous prime is 51493703. The next prime is 51493723. The reversal of 51493717 is 71739415.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51493717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51493777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52768 + ... + 53734.

It is an arithmetic number, because the mean of its divisors is an integer number (3624192).

Almost surely, 2^51493717 is an apocalyptic number.

It is an amenable number.

51493717 is a deficient number, since it is larger than the sum of its proper divisors (6493355).

51493717 is a wasteful number, since it uses less digits than its factorization.

51493717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128.

The product of its digits is 26460, while the sum is 37.

The square root of 51493717 is about 7175.9122764984. The cubic root of 51493717 is about 372.0358123498.

The spelling of 51493717 in words is "fifty-one million, four hundred ninety-three thousand, seven hundred seventeen".